Marine-engine exhaust.



A. MATHIS.

MARINE ENGINE EXHAUST.

APPLICATION FILED 1111x1129, 1912.

Patented Feb. 25, 1913.

PATENT oFFIoE.

,AUGUST'MA'IHIs or CHICAGO, ILLINOIS.

MARINE-ENGINE EXHAUST.

. Specification of Letters Patent.

Application led J'une 29, 1912. Serial No. 706,606..

.To all whom i may concern:

Beit known that I, AUGUST MA'rHIs, a citizen of the United States ofAmerica, and a resident of Chicago, in the county of Cook, State ofIllinois, have invented certain neu7 and useful Improvements inMarine-Engine Exhausts, of which the following is a speelfication.

This invention relates to means for effecting a noiseless andaccelerated discharge of the exhaust lof marine engines, and'moreespecially engines of the internal combustion type. And the presentimprovement has for its object to provide a simple and eflcientstructural formation land combination of parts, whereby the movement ofthe vessel is utilized to withdraw and dissipate l the engine exhaust atthe stern of the vessel, all as will hereinafter more fully appear.

In the accompanying drawingsr--Figure 1, is a detail longitudinalsection partly in elevation, of the rear portion of a gasolene launch orglider to which the present improvement is applied. Fig. 2, is a detailIhorizontal section on line .0c-a', Fig. 1.

Similar reference numerals indicate like parts in both views.

Referring to the drawings, 1 represents the rear portion of the hull ofthe boat, formed with the usual hollow keel 2, and with its bottompreferably formed with a series of transverse air cavities 3 into whichair is constantly forced with a View to ,de-

crease the friction of the hull of the boat in its passage through thewater.

el is the usual propeller having a carrying shaft 5 extending in theusual manner through the hollow keel aforesaid and operatively'connectedin any usual manner to the main shaft of the engine.

6 is a member or casting, which in the present invention constitutes arearward extension of the hollow keel 2, and secured thereto and to therear end of the hull 1 by rivets or in any other ordinary and suitable lmanner.

7 is a longitudinal orifice formed in the underpart of the'member orcasting 6, afore-v said, to afford a bearing for the rear portion ofthepropeller shaft 5 above described.

.-8 isp/an intermediate longitudinal orifice formed in the aforesaidmember or casting 6, adjacent tothe bearing orifice 7 aforesai andadapted for connection to an ordinary drain'boot 9 arranged `in thehollow'keel 2,

scribed arrangement of the outlet orifice of the outlet conduit 11 inclose proximity to the propeller 4, the suction produced by saidpropeller in actual use Vis adapted to effectively aidin the dischargeof the jexhaust frases lthrough thefoutlet conduit 11, and thedissipation of said gases without noise amid the water in thewake of theboat.

12 is a jet or nozzle arranged'centrally and'longitudinally in t-he rearportion of the outlet conduit 1l abovedescribed, and havinglateralsupply openings 13 at its forward end and through the respectivesides of the 4member or casting 6, as shown more particu'- larly in Fig.2. With the .described construction, and as the boat moves through thewater, the lateral supply openings 13 will take in a constant flow ofwater and cause the same to be forcibly discharged through secure byLetters Patent, is

Patented Feb. 25,191.3.`

i and provided with the usual check valve 10,

1. In a boat, the combination of a ,pro-

pellen-a conduit having its rear end disposed in adjacent relation tosaid propeller and its forward end adapted for ,connection to theexhaust of the boat engine, and a discharge nozzle disposedlongitudinally in said conduit and having lateral inlets at its forwardend, substantially asset forth.

2. In a boat having a keel and a propeller the shaft of which passesthrough said keel, the combination with said keel of a member forming arearward extension of the keel and formed with an outlet passage therear end of which is disposed in adjacent relation to the propeller andthe forward .end of which is adapted for connectionto the eX- haust 'ofthe boat engine, substantially as set forth.

end, substantially as set l and for-med the shaft of which passesthrough said keel, the combination with said keel of a member forming arearward extension of the keel and formed with an outle-t passage therear end of which is disposed in adjacent relation to the propeller andthe forward end of which -is adapted for connection to the eX- haust ofthe boat engine, and a discharge nozzle disposed longitudinally insaidpassage and having lateral inlets at itsforward forth.v

4. 1n a boat having a keel and a propeller the shaft eff-Which passesthrough said keel, the combination with said keel of a member forming arearward extension of the keel and formed with a longitudinal bearingoriicefor the propeller shaft and with an outrlet passage the rear/eidof which is disposed in adjacent Irelation to the propeller and' theforward-end of which is-adapt-ed for connection to the exhaust of theboat `engine, substantially vas set forth.

5. I-n a boat having a keel and a propeller the shaft of Iwhich passesthrough said keel,

lt`he"c0mbination 'with said keel of 'a member forming a rearwardextensionof the keel with -a longitudinal bearing end of which isdisposed in of June, 1912.

orifice for the propeller shaft and with an outlet passage the rear endof which is disposed l'in adjacent relation to the propeller and theforward end of which is adapted for connection to the exhaust of theboat engine, and a discharge nozzle disposed longitudinally in saidpassage and having lateral inlets at its forward end, subst-an# tia-Hyas set forth. a

- 6. In a boat having a keel and a propeller the shaft of which passesthrough said keel,

the combinationwith said keel ofa member forming a rearward extension ofthe keel and formed with an outlet passage the rear adjacent relation tothe propeller-*and the forward. end of which is adapted for connectionto the e-X- haust of the boat engine, the said member having a secondarylongitudinal passage adapt-ed for connection to the drain 4boot ofthe'boat, substantially as set forth.

Signed yat Chicago, illinois, this 26th day AUGUST MATHIS.

VVit-nesses:

ROBERT BURNS, HENRY Mon.

